Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a0b2fa80546c52…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 00:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10816c36d20cc5f827bc73506eefed20 SHA-1: 5c66a3310c839c9410001cb4191f7487b102234a SHA-256: b2a0b2fa80546c527fe21c25d31b03b272658c22e6e87a756be262cc0d3c67fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs suggest a pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/392bad1cceb34c5cb0d419d62110eb64/24999662773.pdf In PDF document text
    • http://pozitron-s.ru/userfiles/file/pijegebibutavuw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18d8311b6---78502322602.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/76919397191.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db578ecc10---16273380765.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/buxerez.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3eb0f398b3cdd95c81ad60349fb9025c/dizudarudifusagujiviti.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/69b99c32090d751ecba512cfdc9e8b8e/31749726437.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/diverarifiko.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084bd566919a---63194431310.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/71399006425.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/95574495136.pdfIn PDF document text
    • https://tekmaker.com/upload/files/53617086652.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/mixosubo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/narojuxojurerafobi.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/86820405772.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/vezixix.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/toxatetukap.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4a27f59d509f6419927c7b005328a657/29527102776.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/mawibumekegi.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/dajobutenelutokabaw.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c5d95b4bd2456d0f6977812121502471/xekujimitokeparakopasewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=passover+festival+in+biblePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10412 bytes
SHA-256: 3f987f7547743d478cd6e0e921c199fc0c80c29f49805fe9ede507892f0debcf
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 18492 bytes
SHA-256: 27ee063a24a4c93cf91a76ac1c644a98a61863412ea6b46f11db4514be3f6c59
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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